SU1298712A1 - Device for programmed control of cyclic processes - Google Patents

Abstract

The invention relates to the field of automation, in particular to software control systems, and is intended to control the cyclic processes in the process control system. The purpose of the invention is to increase the reliability of operation. This is possible due to the implementation in the device asynh33 MmFl "(L g

Description

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Ron transition to the next cycle of work and control of both the minimum and maximum time of operation of each executive body. The device for programmed cyclic process control comprises a generator 1, a frequency divider 2, a time master unit 3, a program set block 4, delay elements 1 1, OR 10, an AND 8 element, an zero unit 7. The goal is achieved by introducing a comparison unit 12 into the device The first 13 and second 14 groups of time sensors, the first 15, second 16 and third 17 groups of flip-flops

The invention relates to automation, in particular, to software control systems, and is intended to control cyclic processes in an automated process control system.

The aim of the invention is to improve the reliability of operation,

Fig. 1 shows a functional diagram of the device of Fig. 2-7: functional time diagrams of a driver unit, a program set block, a signaling and recording unit, a zero unit, a unit. compare, time sensor respectively; on Fig-10 time diagrams and the algorithm of the device, respectively.

The device for software control of cyclic processes (Fig. 1) contains a pulse generator 1, a frequency divider 2, a master clock unit, a program set block 4, executive units 5, a signaling and fault recording block 6, an zero block 7, a group of elements AND 8, a group of sensors 9 for terminating operations, a first element OR 10, a delay element 11, a comparison unit 12, a first group of time sensors 13, a second group of time sensors 14, a first group of trigger 15, a second group of control trigger 16, a third group of control trigger 17, group of decoders 18, trigger 19 start, the second element 1111 20, input 21

of the decoder group 18, trigger 19 and the second element S1I 20. This device provides control of the executive bodies and allows you to determine the type of fault when they fail when the work is completed by the executive bodies before the minimum operating time the time of work up to the maximum time of performance of a certain prog paMi-ibi, as well as the continuation of work after the maximum time of execution of a certain program. 10 pieces

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5 devices, input 22 Device stop, counting input 23 and time code recording input 24, block 3, control input 25, counting input 26 and zero input 27 of program set block 4, information output 28, control outputs 29 and outputs 30 controls of program set 4, inputs 31 of time sensor groups 13 and inputs 32 of time sensor groups 14, outputs 33 of sensor groups 13 and 14 of time, first 34, second 35 and third 36 groups of inputs and zeroing input 37 of alarm and recording unit 6 (failure), the first 38 and the second 39 groups of inputs and control in od 40 comparing unit 12, output unit 41, and registration signaling 6 SRB (failure) vkod - 42 comparison unit 12 and the output 43 of block 7 zeroing.

The timing unit 3 contains the counter 44, the element I 45, the driver 46, the block 4 of the program set — counter 47, the register 48, the elements 49-50, and the block 6 the RS-flip-flops 51–53, the elements OR 54-56, the driver 57, Comparison unit 12 contains elements AND 58-61, elements OR 62, and time sensors - counter 63 and elements AND 64 and 65

The device for software control cyclic processes works as follows.

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After turning on the power supply by input to the input 21 Start-up, the installation is set to the zero position on 4 sets of programs, block 6 sigso on the input.

Failure and registration of the failure and through block 7 - resetting the trigger 19 and triggers 5-17. The signals from the output of the zeroing unit 7 simultaneously arrive at the delay element 1I and, after the delay time has elapsed, input 24 is the time of the master unit 3, input 26 of the program set unit 4, and IC- inputs of the trigger 19. On the leading edge of this signal, signals are output on the outputs 29 of block 4 to the executive bodies 5 and recorded during the master block 3 of the time code from the output 28 of block 4 of the program set. On the falling edge of the signal from the output of the delay element 1I, the generator 1 pulses turn on and the time of the master unit 3 starts counting the time interval of the required duration. Duration of time intervals counted

the time set by block 3 is chosen equal to the maximum operating time of the executive bodies of this program. From the output of block 3, at the moment of the end of the counting time interval, a pulse is applied to the input 25 of block 4 of the program set, at the outputs 30 of which correspond to the executive pulses are generated, arriving at the second inputs of a group of elements And 8.

The second group of time sensors 14 at the outputs 33 at the time of the start of the executive bodies 5 generates signals, the duration of which is determined by the minimum operating time of the corresponding executive body. On the falling edge of the signal

at output 33, a switch 45 of start 19 is triggered, and when entering the

one trigger trigger 15, which leads to the inclusion of the first group of time sensors 13 and the appearance at output 33 of a single signal. The duration of the signals at the outputs 33 is determined by the time interval between the maximum and minimum times of the corresponding executive body,

At the moment of switching on of the executive bodies, the corresponding operating controls 16 are switched to a single

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the input 26 of block 4 of the program set and the input 24 of the time of the block 3, both the transition to the next program, 1, 1. After the last program has been worked out, the first program turns on and the cycle of operation repeats.

If any of the executive bodies are out of order 15, there are three possible cases

1, the Executive body stop working until the moment is the minimum time of work of the relevant executive body.

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state, the signals from the outputs of which are fed through the element OR 10 to the input 40 and open the block 12 by comparison NIN. At the same time, the signals from the outputs of the flip-flops 16 are fed to the first circuit of the inputs 38 of the comparison unit 12. Since zero signals are applied to the second group of inputs 39 of comparison unit 12, there is no signal at output 42.

At the time of the end of the work of the executive bodies, the sensors 9 of the end of operations generate pulses arriving at the control inputs of the decoder group 1B.

If the work of the executive body is over from the minimum to maximum operating time, then it corresponds to its proper functioning, code 1 is present at inputs 1 and 2 of the decoder 18, corresponding to the number 2, therefore, at the moment the pulse is applied to the input V of the decoder, a signal is generated at the second decoder output and the trigger I7 switches to the single state. The unit signal from the corresponding trigger will be fed to one of the inputs of the second group of block 12 of comparison 39, After all the executive bodies have finished working, when the codes at the inputs of the first 38 and second 39 groups of block 12 compare, the output 42 will generate a signal that through block zeroing 7, it will go to the inputs of the R, first, second and third groups of control triggers. As a result, the signal at input 40 will disappear, which will lead to locking of comparison unit 12. At the same time, the signal from the output of zero-resetting unit 7 through delay element 1I

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after the delay time has elapsed, the ad will confirm the single state

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Input 26 of block 4 of the set of programs and input 24 of the time of block 3 will provide a transition to the execution of the next program 1, After the last program has been worked out, the first program is turned on and the work cycle repeats.

When any of the executive bodies comes out of service 15 there are three possible cases

1, The executive body has stopped work until the moment - the minimum time of work of the relevant executive body.

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In this case, by the time the signal from the output of the sensor 8 of the end of the operation corresponding to the faulty actuator arrives at the input V of the decoder 18, the unit code will be present at its first input, since the output of time sensor 14 is present and the second input code is zero, since there is no signal at the output of time sensor 13. This leads to the formation of a signal at the first output of the decoder .18, which is fed to the input of the signaling and signaling unit 15.

2. Executive body / 5 / finished work on the interval, T (is the maximum operating time of the corresponding executive body; T is the maximum operating time of all the executive bodies according to a given program),

In this case, by the time the signal from the output of sensor 9 of the end of the operation corresponding to the faulty actuator arrives at the input V of the decoder 18, there will be no signals at its first and second inputs. This will result in the appearance of a signal at the zero output of the decoder 18, which will be fed to the input of the signaling unit 15 and the failure (failure) registration; 3. The executive body did not finish the work at all until the time T. Since at time T the signals appear at the outputs 30 of block 4 of the program set, in this case the control trigger 17, corresponding to the outdated mechanism It does not switch to one state. The impulse from the corresponding output 30 of block 4 of the set of programs passes to one of the outputs of the block of IW elements and is detected by block 6 of signaling and recording a failure (failure).

In all the cases considered, block 6 sends a signal about which executive body went out of order what kind of failure and zeroed the trigger 19, which causes the pulse generator 1 to stop. The device will stop working.

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After eliminating the cause of the failure, the device is started up in the order described.

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Thus, the technical advantages of the proposed device as compared with the known one are in increasing the reliability of operation and speed.

Claims (1)

Invention Formula A device for programmed cyclic process control, comprising a pulse generator, a frequency divider, a time driver unit, a program set block, executive units, a signaling and recording unit, zeroing unit, AND group, rpyiiny sensors of the end of operations, first OR element, delay element, the output of the pulse generator is connected to the input of a frequency divider, the output of which is connected to the counting input, the time of the master unit, the output of which is connected to the control input of the program set block, the output of the time code and which is connected to the information input of the time of the master block, the group of control outputs of the program set block is connected to the inputs of the executive bodies, the outputs of which are connected to the sensor inputs of the end of operations, the first input of the device is connected to the zero inputs of the program set block and the alarm and recording block and the first input of the reset unit, the output of which is connected to the input of the delay element, the group of outputs of the control of the block of the program set is connected to the first inputs of the group of elements I, whose outputs are soy Dine with the first group of inputs of the signaling and recording unit, characterized in that, in order to increase the reliability of the function, a comparison unit, the first and second groups of sensors, the first, second and third groups of control triggers, the group of decoders, the trigger trigger are introduced , the second OR element, the output of the delay element is connected to the recording input of the time of the master unit, with the counting input of the program set block and with the I- and C-inputs of the start trigger, the output of which is connected to the input of the pulse generator, the output of the frequency divider is connected to the first group of sensor inputs of the first group and the first group of sensor inputs of the second group, the outputs of which are connected to the first inputs de7 12987 group encoders and to the I- and C-inputs of the first group of control triggers, the outputs of the control triggers of the first group are connected to the second group of sensor inputs of the first group, you - 5 of which are connected to the second inputs of the group decoders, the output of the zeroing unit is connected to the R-inputs control triggers of the first, second and third groups, controlling the outputs 10 of the program set block, are connected to the S inputs of the second trigger group, the outputs of which are connected to the first group of inputs of the comparison block, to the inputs of the first OR element and the second 15 inputs sensors of the second group, the outputs of the group of sensors of the end of the operation of the connector with the control inputs of the decoders of the group, the first group of outputs of which are connected to the second 20 28 45 and Fig.d 128 a group of inputs of the signaling and recording unit, the second group of outputs of the group decoders is connected to the third group of inputs of the signaling and recording unit, the output of which is connected to the first input of the second OR element, the third group of outputs of the group decoders is connected to the S inputs of the third group of control triggers, outputs which is connected to the second group of inputs of the comparison unit and the second inputs of the group of elements AND, the output of the first element OR is connected to the control input of the comparison unit, the output of which is a second input zeroing unit, the second input device is connected to a second input of the second OR gate whose output is connected to the E-input start trigger. | CC 25 2 i 31 EC 32 7VD 7 G2la; 16 ° t) 5 1MZ) 9 13 (35; 13 (36; / 9 21 73 (hell 65 33 Phases. 7 Fig.8 7 (4) 1  Nacham POAacha signal on VKI, setting S zero noMiKCMue flea H set program and 1 block Ignanlacia. and. check in IfopnupoeaHue signal peremda to the next program, resetting triggers 15 P Squeak Lll.lilliiL Fig.9 Liaise Koia But e / am zaLuguishi OlokZ, issuing signals eojitoAix 23 SfOKat, launching a fireman's organs S, pereklachenis with a single state flepeivaowHue of the trigger a / normal condition, start of the generator 1ipilko, change of char-rods on (tiiujaax remember- gcmpoucmo iTffOxa HavCMl readout oveemiidatchi om J time- AI. and. Irgmizadattsin block 3 I. I feed on axomtanutt nakimayno IpavHu fc / mfenro prp / pnny, issue xndb to In-ivy Hkontrokk (lock t mSopa programs ±. foOftiffoSanie Signal ab emtajf gtchctigo type Htm, .. "Yes  uptOfi 3 OrnitIo stanomao Imoaoto tat Editor N.Egorova Compiled by I.Shvets Tehred I.Popovich Order 886/49 Circulation 864 Subscription BNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Pro Evolstvo-polygraphic enterprise, Uzhtschd, Projecto, 4 Proofreader L.Pltai